1. Push red lever. 2. Insert can. 3. Set timer. Replacing refill can: Keep the unit pointed away from your face at all times. Turn the automatic spray unit to the off position. Remove the empty can and ensure that the red lever is pushed up (see image 1 above). Insert this refill can with the spray attachment facing out (see image 2 above). Turn the unit ON by selecting desired time setting (see image 3 above). The first spray will come after a 15 second delay.